Table 10: Flux ratios for the center of the Milky Way, NGC 253, Henize 2-10 and the Cloverleaf QSO.
F Milky Way NGC 253 Henize 2-10 Cloverleaf

(W m^-2)

$\frac{{\rm CI}(^{3}{\rm P}_{1}-^{3}{\rm P}_{0})}{{\rm CI}(^{3}{\rm P}_{2}-^{3}{\rm P}_{1})}$ 1.00 1.15 Not observed 0.42

$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(1-0)}$ 7.37 22 18.75 $\ge$ 28.6

$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(2-1)}$ 1.84 2.32 3.6 -

$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(4-3)}$ 0.67 0.34 0.64 0.47

$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(5-4)}$ 0.72 0.21^* 0.27^* 0.33

$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(6-5)}$ 1.03 0.20 0.31 -

$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(7-6)}$ 1.18 0.26 0.23 0.12

$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(8-7)}$ 1.09 0.66^* 0.18^* -

**Table 10:** Flux ratios for the center of the Milky Way, NGC 253, Henize 2-10 and the Cloverleaf QSO.
F	Milky Way	NGC 253	Henize 2-10	Cloverleaf
(W m^-2)
$\frac{{\rm CI}(^{3}{\rm P}_{1}-^{3}{\rm P}_{0})}{{\rm CI}(^{3}{\rm P}_{2}-^{3}{\rm P}_{1})}$	1.00	1.15	Not observed	0.42
$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(1-0)}$	7.37	22	18.75	$\ge$ 28.6
$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(2-1)}$	1.84	2.32	3.6	-
$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(4-3)}$	0.67	0.34	0.64	0.47
$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(5-4)}$	0.72	0.21^*	0.27^*	0.33
$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(6-5)}$	1.03	0.20	0.31	-
$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(7-6)}$	1.18	0.26	0.23	0.12
$\frac{^{12}{\rm CO}(3-2)}{^{12}{\rm CO}(8-7)}$	1.09	0.66^*	0.18^*	-

^* These values are computed from PDR models.

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